Back to blonde! January Jones sports short locks as she returns to Los Angeles with baby boy Xander after Sundance

She's been toying with her hair colour as of late, with many crying out for the Mad Men actress to return to Betty Draper's cropped blonde style after she dared to go red and brunette.

The 34-year-old actress so far hasn't looked back after returning to the favourite style of her fans a few weeks back, and landed in Los Angeles on Saturday looking cool and casual in a black leather jacket.

January, with her 11-month-old son Xander in tow, wore a pair of brown round-lens glasses matched with a white cardigan and a pair of sensible leather boots and jeans for a comfortable flight back home after attending the Sundance Film Festival in Utah.

Hot mom: January Jones showed off her short blonde hair as she arrived in Los Angeles with her son Xander on Saturday

Her tiny tot mugged for the camera wearing a sweater with a flying bird print and brown pants as his mother pushed him through the airport in a stroller.

The actress has been recently wearing her hair a dark brown colour after filming last season of AMC's critically acclaimed Mad Men.

And in the western film Sweetwater she changes it up again, playing a strawberry-blonde former prostitute with an affinity for going topless named Sarah who fends for herself in nineteenth-century New Mexico.

Just the two of us: The Mad Men actress and her 11-month-old wore matching black and tan boots

Traveling: The 34-year-old was just at Sundance in Park City, Utah to promote her new film Sweetwater

January's jem: The actress has yet to reveal who the father of her son is

The villainous character is a stark contrast for January, who is accustomed to playing the perfectly pristine Betty Draper.

She said in a recent interview with Vulture: 'I related to her strength, as brutal as it is.

'I just think it's really fun for me because it's not things that I get to do in real life. I'm not going out and punching people and blowing s*** up. If you're an actor, wouldn't you want to do fun things like that?'

A colour for all seasons: January has displayed a few different hues with help from her hairdresser

Red or dead: January Jones shows off her appealing choice of knitwear at the official cast and filmmakers party for her latest movie, Sweetwater

In one scene in particular, January tackles nudity for the first time in her career - and just months after the birth of her son.

'I'd just stopped nursing and I think modestly just kind of flies out the window sometimes when you're a mom, and I was like, whatever,' she told theLos Angeles Timesof doing the scene.

'There were certain times in my career where I felt, ''I don't really need to do that.'' But then, I'm a human being, I change my mind.'

She continued with a hope that she doesn't soon regret that decision: 'I might change my mind when there's a theatre full of people watching it - with my parents.'

Hollywood players: January poses with co star Jason Isaacs and the film director Noah Miller to whom she has been romantically linked